package network;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class Server {
    private DatagramSocket socket = null;

    public Server(int port) throws SocketException {
        socket = new DatagramSocket(port);
    }

    public void start() throws IOException {
        System.out.println("服务器启动!");

        while (true){
            DatagramPacket requestPacket = new DatagramPacket(new byte[4096], 4096);
            socket.receive(requestPacket);
            String request = new String(requestPacket.getData(), 0, requestPacket.getLength());
            String response = process(request);
            DatagramPacket responsePacket = new DatagramPacket(response.getBytes(), response.getBytes().length, requestPacket.getSocketAddress());
            socket.send(responsePacket);
            System.out.printf("[%s:%d] req: %s; resp: %s\n", responsePacket.getAddress().toString(), responsePacket.getPort(), request, response);
        }
    }

    public String process(String request){
        return request;
    }

    public static void main(String[] args) throws IOException {
        Server server = new Server(9999);
        server.start();
    }
}
